Solve the Equation $4 x ^ { 2 } - 8 x = 0$

Solve the equation. $4 x ^ { 2 } - 8 x = 0$

A) $\{ 8,0 \}$
B) $\{ 2,0 \}$
C) $\{ 4,8 \}$
D) $\{ 2,4 \}$
E) none of these